Spring structure.



No. 882,654. PATBNTED MAR. 24, 1908.

- W. R. SMITH.

SPRING STRUCTURE.

APPLICATION FILED OUT 29 1006 2 SHEETS-SHEET 1.

UNITED sra rps PATENT onricn.

WATSON R. SMITH, OF JACKSON, MICHIGAN, ASSIGNOR TO VENTILATED CUSHION ANI) SPRING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION.

SPRING STRIJ'CTURE.

naesacee.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed October 29, 1906. Serial No. 341,126.

To all whom it may concern:

Be it'known that I, VVA'rsoN R. SMITH, a citizen of the United States of America, and

a resident of Jackson, in the coun ty of Jack- 5 son and State of Michigan, have invented i spring cushions; to provide for the desired" yielding resistance todifferent pressures; and to provide an improved arrangement for connecting together the component parts of the spring structure. These objects are accomplished by the device shown in the accompanying drawings, in which:

Figure 1 is a top plan of a cushion spring constructed according to this invention. Fig. 2 is an end elevation of the same. Fig. 3 is an underneath plan having some of the parts which would otherwise appear in the background, omitted or broken away for the sake of clearness. Fig. 4 is a section on the line 4 4: of Fig. 3.

In the construction shown in the drawings, two .sets of furniture springs of respec tively different heights are used. The lirst set consists of long springs l and the second set consists of short springs 2. The short springs are secured within and substantially concentric with the long springs 1. Said short springs are of frusto-conical form, while the long springs gradually widen, both toward the tpp and the bottom. The top convolutions oi the long springs lie in contact with'each other and are secured together by metal clips 3, and surrounded by a border-frame 4. The bottom convolutions of the long springs are secured to the frame work consisting of the members 5 and the border frame 6. These parts are sccured together by means of metallic crosspieces 7. The cross pieces 7 are provided with struck-up lips S which are bent over the bottom convolutions 9 of the short springs l. Said cross-pieces are also secured to the members 5 and to the border frame 6.

In operation, when used by a person of average weight, the springs 1 ordinarily support the weight upon the cushion, but

, lips.

in case of a jar, as when used on a vehicle passing over a roughroad, the yielding of the springs 1 is at times suflicient to bring the weight of the passenger upon the short springs 2 whichthen assist the long springs in resisting the jar, and thereby relieve the springing of the cushion and add to the eomfort of the passenger. Vhen used --by a heavy person, the weight is supported by both sets of springs. The long s rings 1. support person of light weight wit iout depressing tie short springs 2. The short springs are preferably made oi small enough diameter to avoid contact of their convolutions with the convolutions of the long springs when the latter are de )ressed. This avoids the noise which would otherwise be caused through contact of the convolutions of the two sets of springs.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a spring cushion, the combination of a frame, a plurality of spiral springs secured thereto, a cross-piece secured to and span ning the base of each of said springs, and a plurality of shorter spiral springs, each of the same being secured to one of said crosspicccs within and substantially concentric with one of 'said longer springs.

2. In a spring cushion, the combination of a frame having a plurality of spiral springs secured thereto, a cross-piece secured to and spanning one of the convolutions of each of said springs, and a plurality of shorter spiral springs each securcd'to one of said crosspieces within one of the longer spiral springs.

, 3. In a spring cushion, the combination of a frame having a plurality of spiral springs secured thereto, a cross-piece secured to and spanning one of the convolutions of each of said springs, each of said crossieces being provided with struck-up'lips, an a plurality of shorter spiral springseach having one of its convolutions in contact with said crosspiece and secured thereto by means of said 4. In a spring cushion, a frame comprising a series of arallel rods,.crosspieces connecting pairs 0 said rods, and a plurality of pairs of spiral springs, each pair consistiu of a longer and a shorter spring arranger concentrically, the lower ends of the longer springs being attached to said rods, and the lower ends of the shorter springs being attached to said cross-pieces.

5. In a spring cushion, a frame compris ng a series of parallel rods, sheet metal cross Q pieces connecting pairs of said rods, ande ends of theshort-er springs being attached to said cross-pleces.

Signed at Chicago VVATSON E. SMITH.

16 day of October Witnesses WM. R. RUMMLER, S. F. RANDOLPH, Jr- 

